mixerctl question

[beaker%sdf.org@localhost (beaker)]

I've been testing the 11.x beta on an older Lenovo G550 laptop and
noticed mixerctl shows two outputs, output.master and output.master2.
Unfortunately it is the second one that is actually being used but
most of the mixer control apps I like to use only see /dev/mixer0
which is apparently bound to output.master (I think; my understanding
of audio stuff is not great).  In short, I'm only able to do volume
control via mixerctl -w output.master2++ or ..-- and not with apps
like rexima.  Is there some way to swap the outputs?

My real preference would be to bind the Fn + Vol-/Vol+ keys to the
appropriate mixerctl command strings but said keys don't appear to
generate any keycodes at all currently hense the interest in using
rexima or similar.

For reference:

$ mixerctl -a
outputs.master=0,0
outputs.master2=120,120
inputs.line=0,0
inputs.line.mute=on
outputs.dacsel=DAC00,DAC02
record.source=ADC01,ADC03

TIA,
-B